I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
tweets tweeds twats twits
sweets weets tweets weeds wets wheats whets mayweeds rewets seaweeds sweats swedes tweeds
tweed tweedy tweet tawed tewed towed